nice work.. but the regex you used for ur trigger can use some work.
in stead of

on $*:text:/^[.!@]imdb*/Si:#: {

use

on $*:text:/^[.!@](imdb)\s(.+)/Si:#: {

and then change

$replace($2,$chr(32),+)

to this

$replace($regml(2),$chr(32),+)

it's just the way you have ur regex it will trigger on !imdbhmmbblahbblah csi